My guess is they will announce the new addon they are working on around the time GW2 and Tera comes out, since FFXI is at it's worst time ever right now they need something around then to try stop the bleeding of players that will want to try those due to sheer boredom. I can see Tera being the biggest problem for FFXI right now since it's endgame content is low-man friendly and it's just so damn fun to play.